invidious/assets/js/pagination.js

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'use strict';
const CURRENT_CONTINUATION = (new URL(document.location)).searchParams.get("continuation");
const CONT_CACHE_KEY = `continuation_cache_${encodeURIComponent(window.location.pathname)}`;
function get_data(){
return JSON.parse(sessionStorage.getItem(CONT_CACHE_KEY)) || [];
}
function save_data(){
const prev_data = get_data();
prev_data.push(CURRENT_CONTINUATION);
sessionStorage.setItem(CONT_CACHE_KEY, JSON.stringify(prev_data));
}
function button_press(){
let prev_data = get_data();
if (!prev_data.length) return null;
// Sanity check. Nowhere should the current continuation token exist in the cache
// but it can happen when using the browser's back feature. As such we'd need to travel
// back to the point where the current continuation token first appears in order to
// account for the rewind.
const conflict_at = prev_data.indexOf(CURRENT_CONTINUATION);
if (conflict_at != -1) {
prev_data.length = conflict_at;
}
const prev_ctoken = prev_data.pop();
// On the first page, the stored continuation token is null.
if (prev_ctoken === null) {
sessionStorage.removeItem(CONT_CACHE_KEY);
let url = window.location.href.split('?')[0];
let params = window.location.href.split('?')[1];
let url_params = new URLSearchParams(params);
url_params.delete('continuation');
window.location.href = `${url}?${url_params.toString()}`;
return;
}
sessionStorage.setItem(CONT_CACHE_KEY, JSON.stringify(prev_data));
let url = window.location.href.split('?')[0];
let params = window.location.href.split('?')[1];
let url_params = new URLSearchParams(params);
url_params.set("continuation", prev_ctoken);
window.location.href = `${url}?${url_params.toString()}`;
};
addEventListener('DOMContentLoaded', function(){
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const pagination_data = JSON.parse(document.getElementById('pagination-data').textContent);
const next_page_containers = document.getElementsByClassName("page-next-container");
for (let container of next_page_containers){
const next_page_button = container.getElementsByClassName("pure-button")
// exists?
if (next_page_button.length > 0){
next_page_button[0].addEventListener("click", save_data);
}
}
// Only add previous page buttons when not on the first page
if (CURRENT_CONTINUATION) {
const prev_page_containers = document.getElementsByClassName("page-prev-container")
for (let container of prev_page_containers) {
if (pagination_data.is_rtl) {
container.innerHTML = `<button class="pure-button pure-button-secondary">${pagination_data.prev_page}&nbsp;&nbsp;<i class="icon ion-ios-arrow-forward"></i></button>`
} else {
container.innerHTML = `<button class="pure-button pure-button-secondary"><i class="icon ion-ios-arrow-back"></i>&nbsp;&nbsp;${pagination_data.prev_page}</button>`
}
container.getElementsByClassName("pure-button")[0].addEventListener("click", button_press);
}
}
});